JPS59174469A - Bag for tubular germless packing - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tubular sterile packaging bag that is made for efficiently producing a sterile packaging bag.

Conventionally, polyethylene has been used as a sterile packaging bag for storing contents such as drums of juice, but due to poor gas barrier properties, the surface of the juice turns brown due to the influence of oxygen even after filling and sealing. For preservation, it had to be frozen. However, using such bags is expensive, so bags made of plastic film coated with aluminum have also been used, but they are also expensive, do not have a large capacity, and are easy to clean inside the bag. There were also problems such as the inability to sterilize the product, which had to be considered.

The present invention was made to solve these problems.
The feature is that it provides a tubular sterile packaging bag made of two or more layers of tubular plastic film, with the outer layer being a gas barrier resin and the inner layer being a heat-sealing resin. The object of the present invention is to provide a tubular sterile packaging bag which is sealed in advance and kept in a hermetically sealed state. Examples of gas barrier SL resins in the present invention include saponified ethylene-vinyl acetate copolymers, nylon polymers, and polyvinylidene chloride resins, and examples of heat-sealable resins include polyethylene, polypropylene, and ethylene-vinyl acetate copolymers. Examples include polyolefin resins such as copolymers and other appropriate resins. Further, in the present invention, as long as there are two or more layers, three layers or multiple layers may be used, and the structure may be multilayered as appropriate with an adhesive layer interposed therebetween.

In order to create a sterile packaging bag, for example, if the film is formed by extrusion using a multilayer coextrusion inflation device, the inner surface is exposed to high temperatures during extrusion and can be said to be in a sterile state, so this method is the easiest. It is possible to sterilize the bag, for example, by sealing it and sealing it to prevent contamination by germs, creating a sterile bag. In addition, it is also possible to perform extrusion film formation and sterilization using an extrusion lamination device, and sterilization is not particularly limited.

To make a bag, a long tubular film is folded in half in the length direction so that the cross section looks like that shown in Figure 1.
It is only necessary to apply seals appropriately in the transverse direction, and in order to achieve a sealed state, it is possible to seal these long tubular films in a continuous manner in the transverse direction at regular intervals (11). Naturally, continuous bags as shown in FIG. 4 are also within the scope of the present invention, and these continuous bags may be opened and unsealed, for example, when filling the contents.

Next, the configuration of the present invention will be described according to examples. In the case shown in Fig. 1, the gas barrier resin layer of the outer layer (1) is ethylene-
This is a cross-sectional view of a three-layer film (3) comprising a heat-sealable resin layer (2) made of polyethylene as an inner layer via an adhesive resin layer (12) made of polyolefin modified with a saponified vinyl acetate copolymer. This is a tubular film produced by extrusion using a multilayer coextrusion inflation device.

As shown in Fig. 2, the bottom (4) is heat-sealed to form a bag (5), and the opening (6) is filled with contents, such as sterile juice (10), and then filled with a bag (7). Heat sealed as shown. At this time, it is effective to perform nitrogen gas purge packaging by replacing the air above the bag with nitrogen gas during filling. In addition, since the inner surface of the blown film of this example is exposed to high temperatures during film formation and can be said to be in a sterile state, the mouth (8) and bottom (9) of the bag (15) are
) before filling the contents into a sealed state, the sterile condition inside the bag will be maintained. Packaging is extremely easy and convenient. Furthermore, in order to achieve stronger sterilization, nitrogen gas purging packaging may be used as described above, and in order to open the opening (8) during filling, the previously heat-sealed portion may be cut. . In order to strengthen the sterilization, for example, heat sealing may be performed immediately after extrusion film formation to create a sealed bag as shown in FIG. 4, but there are no particular restrictions on this. Further, it goes without saying that a suitable seal may be used in place of the heat seal.The above example is a preferred embodiment of the present invention, and it is of course possible to adopt other suitable embodiments of the present invention.

Juices such as orange juice and tomato juice can be exemplified as the filling contents in the present invention, but it is of course possible to exemplify other juice analogues and other appropriate substances.

The present invention is as described above, and according to the present invention, the contents can be stored in a sterile state for a long period of time, and in that case,
There is no risk of discoloration or spoilage of the contents, and the effect is exceptional, and it is even more effective when applied to juices. Furthermore, since the present invention is mainly produced by the inflation method, it is extremely easy to produce a large bag with a folding width of 100 cm, and it is extremely convenient in this respect as well.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a tubular plastic film according to the present invention. Fig. 2 is a front view showing one embodiment of the tubular sterile packaging bag according to the present invention after filling with contents, and Fig. 3 shows a sealed state by sealing in advance before filling with contents. FIG. 4 is a front view showing one embodiment of a tubular sterile packaging bag according to the present invention, and FIG. 4 is a plan view showing an example of a continuous bag. (1) --- One outer layer (2) ---
1. Inner layer (3) --- Tubular plastic film (4) --- 1. Bottom heat-sealed part (5) --- Open bag (B) ---
-Opening (7)---1st part heat sealing part (8) (9)---1st heat sealing part (10)---1 Contents (U)---m- Transverse seal (15) --- Hermetically sealed sterile packaging bag without any contents Patent Applicant

Claims (2)

[Claims] (1) A tubular sterile packaging bag consisting of two or more layers of tubular plastic film (3), the outer layer (1) of which is a gas barrier resin, and the inner layer (2) which is a heat-sealable resin. (2) The tubular sterile packaging bag according to claim 1, which is sealed in advance to maintain a sealed state before filling with the contents.